Combined type-writing and computing machine.



.B. C. SHCKNEY. COMBINED TYPE WRITING AND COMPUTING MACHINE.

7SHEETSSHEET I.

B. C. STICKNEY. COMBINED TYPE WRITING AND COMPUTING MACHINE.

APPLICATION FILED NOV. 2, 19H- Patented Mar, 28, 1916.

ISHEETS'SHEET 2.

B. c. STICKNIEY.

COMBINED TYPE WRITING AND COMPUTING MACHINE APPLICATIQN FILED Nov. 2, 1911.

Q 1,177,149. Patented Mar. 28, 1916.

[SHEETS--SHEET 3.

B. C. STICKNIEY.

0MBINED TYPE WRITING AND COMPUTING MACHINE. APPLICATION FILED NOV- 2, 19H.

1,177,149. I I Patented Mar.28,1916.

7 SHEE-TS SHEET 4.

B. C. STICKNEY.

COMBINED TYPE WRITING AND COMPU HNG MACHINE.

APPLICATION FILED NOV-2,191!- Patented Mar. 28, 1916.

7 SHEETS-SHEET 5- B,.C. ;STICKNEY..

COMBINED TYPE WRITING AND COMPUTING MACHINE. APPLICATION FILED NOV. 2, I911.

1,177,149. Patnted'lIIar.28,1916. I I SHEETS-SHEET e.

92 a 5%? LIJH M! N 2% %5 2% =1 I Q Efi $5 I: T: g A c g c w o c Q o 3 R1 A Q I3: 1 8 5% a O D3 0 I32 O D: a I a N g n c. ST-ICKNEY.

COMBINED TYPE ITING AND COMPUTING MACHINE. APPLICATION FILED NOV. 2, 1911.

1 SHEETS-SHEET].

Patented Mar. 28,1916.-

Tia

Ares

BURNHAM C. STICKNEY, 01E ELIZABETH, NEW JERSEY, ASSEGNOB, BY HIE-SHE .ASSIGDL IVIEN'IS, TO UNDEEWGOD COMPUTING'IEACHINE C(EMFANY, OF NEW $312K, N. A

CORPORATIGN OF NEW YORK.

COMBINED TYPE-WIRITING AND COMPUTING MACHINE.

To all whom it may concern Be it known that I, BURNHAM C. STICK-l NEY, a citizen of the United States, residing in Elizabeth, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in Combined Type-Writing and Computing Machines, of which the following is a specification.

This invention relates to computing machines, especially to those which are combined with typewriters, and more especially to those of the-type illustrated in the Hanson Patents Nos. 905,421 and 905,422, and in the pending application of Frederick Hart, No." l66,836, filed Dec. 10, 1908. In this type of machine, numeral keys, which are preferably the same keys that operate the numeral types of thetypewriter, are depressed to select or set certain pins of the computing 'mechanism; and after all the keys are operated for writing a number, a general operator is brought into action to rotate the computing or dial wheels, each to an extent determined by the corresponding pin. These pins are mounted upon bars, and the bars are formed with racks which mesh with pinions associated with the respective dial wheels, the latter loosely mounted upon an arbor. a

One of the main objects of the present invention is to enlarge the capacity of the machine without unduly increasing its cost or complicating its mechanism, and another of the main objects is to provide for accumulating separately the grand result of all of the additions or computations performed by a set of computing wheels on this general type of machine.

In one form of my invention I provide two sets of computing wheels, although the invention is not limited to two sets. The wheels in one set are interjacent among those in the other set. I illustrate the I r wheels as mounted coaxially, those in one set alternating with those in the others'et upon a single arb r.

Each of the pin-carrying'barsis forked, and each member of the fork has a,-rack, and these racks engage pinions upon adjacent wheels, so that. when the fork d rack ad vances, these wheels are torn one wheel being one set" and the other Wheel being.

Specification of Letters Patent.

Application filed November 2, 1911.

wvheel is moving to bring the zero thereon Patented Itlar. 1916.

Serial no. scales.

in the other set. Hence the same addition or computation may .be performed, on two sets of wheels concomitantly.

In said patents and said application, there is illustrated a power-driven driver for the tens-carrying trains of mechanism; this driver being connected to said r general operator. I have contrived tocause this drlver to operate tens-carrying trains for both sets of computing wheels. In said patents and said application, each dial wheel is provided with'a starting tooth which effects a slight advance movement of a tenscarrying train; and said power-driven driver thereupon completes the movement of said train, so that ten is carried to the wheel of next higher denomination.

According to the present improvements, the computing wheels are all provided with starting teeth, and each, set of computing Wheels has its own set of tens-carrying trains; each train being start ed by its own associated dial wheel; there being separate trains for all the dial wheels or computing wheels in both sets. The power-driven driver is common to all of the computing trains, however, so that when any computing train in either set has been started by its fifi dial wheel, the power-driven driver will complete the operation of that train. In other words, the two sets of tens-carrying mechanism ramify from the power-driven driver to the two sets of computing wheels which are mounted alternately upon a single arbor.

In order to render it convenient to read the interjacent dial wheels, that is, to distinguish the number indicated by one set of wheels from the number indicated by the other set of wheels, I provide a cover plate for all the wheels, and there is arranged in the cover plate an individual sight opening for each wheel. Thesight openings for one set of wheels have a staggered relation to the sight openings for the other set of wheels; or in other words, there is an upper row of openings through which one set is to be read. and a lower row of openings through which the other set is to be read.

The starting pins of the tens-carrying mechanisms are so placed, that when any ind cated by the lower set or 32 will be rotated, each to an extent determined by the position of the set pin 20 on its bar 21.

It will be noticed at Figs. and 11 that each bar 21 is forked at 38 at its forward. end, one member of the fork having the 'rack 38, and the other member having a of any bar 21', two dial wheels are rotated,

one dial Wheel 32 belonging in one set, and the adjacent dial wheel 33 belonging in the 1 1- other set; the coal wheels of one set alternating or lying interjacent with those in the other set, as seen clearlyiat Fig. 6.

l ft Fig. 9 is illustrated a method-in which readings can be taken from both sets of wheels; there being a cover plate 41 for the wheels, and said plate having two rows of individual sight openings; the upper row of openings being marked 42, through which may be read the number on the wheel 32, and the lower row of openings being mar ed l3, through which may be read the number gang of computing wheels 33.

At Fig. 6 all of the wheels are shown in zero positions; and it will be seen that the on the wheels have staggered relation; or in other words, the zeros on the wheels are advanced a single point beyond the Zeros on the wheels 33. It will be perceived that the portions of the cov'erplate between the openings in each row, cover the wheels which intervene between said openings, so that the wrong numbers cannot be read therefrom. The actuation of the rack bars 2-1 is the same as heretofore; the general operator being driven by a crank 44: or otherwise, and comprising a pair of racks 45, 46, to which a shaft 47 of said crank is connected by seg'ments48 fixed on said shaft, and idle pinions 49 intervening between said segments and said racks 4:5 and 46. The racks are connected by horizontal cross bars 56, 51. The bar 50, as usual, engages any of the pins which have been depressed by the keys; and accordingly the racks are driven forward and the computing wheels in both sets rotated. The return movement oft-he general operator may be caused or assisted by a spring 52, Fig. l; and the cross bar 51 of the general operator may engage lugs 53 pendent from the bars 21 to drive the latter backward to normal positions; all the dial wheels in both sets remaining moticnless while this is done being held by spring detents 54, and the pinicns 35,

being permitted to rotate idly in return directions by reason of their pawl and ratchet connections to the dial wheels.

Referring now to the dial or computing Wheels 32, it will be seen that each one there'- of has a starting tooth 55, Fig. 16, projecting from its periphery to engage and start a pinion 56, which, with a three-toothed "wheel 57 fixed thereto, forms a train for carrying tens to the wheel 32 of next higher denomination; each pinion 56 being connected to its three-toothedwheel 57 by a hub 58, which is elongated to pass by the intervening dial wheel 33 of the other set; tens being carried from Wheel to Wheelupon one'set of dial wheels independently of the other set of dial wheels, thereby permitting accumulation on one set of the results of all the computations performed upon the other set,'since the wheels in either set may be returned to zero without disturbing those in the other set, and since from that point new numbers can be added concomitantly on both sets, thus giving on one set the aggro gate of all the additions performed upon the other set.

. T he pinion 56 having-been moved by the tooth to the position seen at Fig. 16. as the Wheel 32 turned from 59 to 0, a broad tooth 59 upon said pinion is brought into the path of a segment or driving tooth 60 fixed upon a square shaft 61 operable by the general operator aforesaid, during the return stroke thereof, said shaft 61 being connected, as usual, by a pinion 62 and a driving gear 63 with the rack 46 of the general operator; a clutch being provided, as usual, to permit the segment shaft 61 to remain stationary during the forward movement of said general operator, and to revolve said shaft during the return movement of said general operator; said clutch being similar to the other clutches shown, and comprising a ball 64 pressed by a spring 65 into a recess 66 in the pinion 62,

.Fig. 3.

It will be understood that the starting teeth 55 on the computing wheels operate only during the forward stroke of the general operator, thereby starting the pinions 56 to positions to be engaged by the segments 60; and the latter are spirally placed upon the shaft 61, as seen best at F i 14, so that one tens-carrying train is fully operated before the pinion 56 of the succeeding tens-carrying train can be engaged or operated by the succeeding segment 60. Thus tens are carried from Wheel to wheel along the set of Wheels 32, independently of the wheels 33. It will be understood that, as usual, every third tooth of each pinion 56 is cut away or thinned as at 67, to permit the associated segment 60 to pass freely by said pinion when the latter is in normal position; the cutaway teeth being howeverv thick enough to beengaged by the usual spring detent 68, Fig. i. When any pinion 56 is actuated by its segment 60-, it is brought to Exposition which is one-third of a revoin; con'iputine wheel {1 a computing additi nal I Jl I u Oi sai i 56 anc are three-too her and. meshing and similar to perinh ally groorer v 4 tor racks S8, Fig, 17.

the movement of the starting t anrlv nhe 33 to the Zero 3- the pinion 7" is rotated to th if into the path of seginen' fixed on the square it (31 so th rotation said shaft, the train "TL he ieraef; "o crliv tens to the nex x L 1 1 computing vheel 03, v ie'tler i i 1 f 1')" i a nr chaaism or The segments 78 have a spiral I nient, (*ig. 13) similar to that of the ment: 60, on the shai" H, for the same purpose; and they alternate with or he interjacent among the segments 60* as seen Figs. 6 and 16 so that each of the segments and 78 may register with its associated pinion or Y1. The segments 78 may have the same relation the pinions 71' as the segments have to the pinion; o6; an(l since the gnome '(l are placeo oelon the pi,- ens 18 the is (5 mar helo'i- "r I seen 60 at relation s be seen Sifl operate plurrdit f incle trains of i devices.

may he reset rwzero, 33 remain stationary.

key 9 usual type, to operate the usual Li er which, by means of a wrist ee at 3- 03, (56, Fig. 3 with the JJ SO Lila shel foriiarclly; and

a, ninion 86 which. n. I 3 7 nection 81* 85: 89 F152. 8 smilar to that arbor 01' tthe lane" 18 otated Said arbor has means to it with all-of the dial Wheels one set, said connecting means comprisin 8? iormecl in. said arbor,

pressed outwardly from v sarings 89, into recesses 90 ii the hubs of Wheels is similar to that i i ition except i e placed farther apart hef tl .lrention of the Wheels 33 "i tlr the Wheels 33 not lute L and hence ro- 'llhe mits wheel is placed in other pockets. as usual, for et said application. to start marrying t ain from the unitsv wheel the Wheel; all the remaining Wheels moving from 9 t O l i return stroke of the general operator.

For the Wheels to Zero, each ears is prorirleil of a with an idle gear 91 similar to gear 75, all the gears 91 nioun ecl loosely on an arbor 92 Figs. 4c and 5, upon the enrl ot which is fixed a, thumb Wheel or button Figs. 5 and 5. Upon this arbor 9:2 is fixeo a dish" 94- similarto the disk 95 fixed on arbor 34, and having a similar notch 96 to receive a ipring (letent 97; aid rletents holding the arbors 34: and 92 in normal positions. At any time, by giving the button 93 a revolution, (to at Vance the wheels 33) anrl then operating the general op rator handle 4-4, the Wheels 33 may he set to zero. The arbor 92 has poenets 98 similar to the pockets of the arbor 34-, and the units pocket is also in aclvane-e of the remaining Dockets, so that the uni dial wheel 33 is rotated to Zero bv the but n 93, While all the other Wheels 33 are rotatiPQ; one at the ensuing ope 'ation oi ti e general operates e, the tens carrying devices are called into action to advance all the the segments '28 from the pi niorrs 71. It will be seen therefore that either set of -wheels 33 or 3:2 may be turned to zero independently the other set, andjalso that both sets may be returned concomitantly by first operating the button 93 and then (lepressing the Zero lie 79, and then recipro c: ting the crank The pins 1 30,, after the completion of a corn station are lifted to normal positions urine; the ensuing 1 1 1 higher Wheels 33 to Zero and clear tion with a plurality of sets of coaxial comby a horizontal plate 99, Figs. 4 and 5, which is similar to the corresponding plate, and operates in the same way, as set forth in said Hart application, but is made of greater width to accommodate the increase in width of the set of bars 21.

The detents 54 for the wheels 32 are connected by springs 100 to the detents'68 for the pinions 56, as set forth in said Hart application. The detents 54: for the wheels 76 are actuated by springs 103i. Detents 102 having springs 103 are also provided for the pinions 71.

For cross adding, several of the adjustable dogs 22 may be provided as illustrated at Fig. 2; one dog for each written column. In writing a single line across the'work sheet, numbers are written in the various columns, and as a number is being written in any column, its dog 22 acts successively upon the iacks 23, to determine the denomination with which computing shall be efi ected, or

in other words, to select the dial wheel which has to be acted upon. At the conclusion of each line of writing, sum of all the items written on said line appears upon one of the sets of computin wheels, for instance, upon the wheels 32. At the end of the firstline of writing, the same number appears upon both sets and 33. Then the wheels 32 may be returned to zero, without disturbing the wheels 33; the sum of the cross addition being written in the right hand margin of the work sheet. Then another line may be written, and the sum of the cross addition thereof placed under the first sum,

the wheels 32 being again returned to zero;

but the wheels retain or show the grand total or" all the items written in all the columns. It will be understood also that one totalizer, for instance, the totalizer 32, may be used for effecting vertical additions, and returned to Zero from time to,.time, the grand total of: all of said vertical additions beinghowevcr accumulated upon the other totalizer 33. Other uses and advantages will be apparent to those familiar with the art.

Variations may he resorted to within the scope of the invention, and portions of the improvements may be used without others.

Having thus described my invention, I claimz--- 1. In a computing machine, the combination with a plurality of sets of coaxial computing wheels, those in one set interjacent;

among those in another set, of means for positively operating wheels in said sets concomitantly.

In a computing machine, the combinaputing wheels. those iironc set interjacent among those in another set, of means for positively operating wheels in said sets concomitantly, and means for setting all the wheels in one set to zero independently of the remaining wheels,

3. In a computing machine, the combination with a plurality of sets of coaxial computing wheels, those in one set interjacent among those in another set, of meansfor v ual sight opening for each of said wheels,

said sight openings being so disposed so that the readings on one set of Wheels can be taken independently of the readings on another set of wheels.

5. In a computing machine, the combination with a plurality of sets of computing wheels, those in one set interjacent among those in another set, of rack bars for operating said wheels, each rack bar being forked,

and each fork having racks to operate wheels ofsimilar denomination in different sets, an intermittent driver common to all of said wheels, and sets of tens-carrying devices ramifying from said common driver to said sets of wheels.

6. In a computing machine, the combination with a plurality of sets of computing wheels, those in one set interjacent among those in another set, of means to concomi-' tantly operate wheels of similar denomination in different sets to the same extent, whereby the same numbers are carried into said sets of Wheels concomitantly, and means for turning the wheels in one set to zero after a. computation has been fcompleted on the wheels in that set, independently of the remaining wheels, whereby the wheels in another of said sets may be caused toindicate the grand result of all the computations carried out on the wheels in the set so zeroized. v 7. In a computing machine, the combination with a plurality of sets of computing wheels, those in oneset interjacent among those in another set, of means for operating concomitantly wheels in both sets, a plurality of sets of tens-carrying devices, one set for each set of computing wheels, each set of tens-carrying devices including a pinion started by its associated computing wheel and means connected to said pinion to advance the computing wheel of next higher denominati n in the same set, an in-- termittent power-driven driver, and two sets of segments or teeth connected to said driver to engage and drive the pinions in both of said sets of tens-carryingdevices.

8. In a computing machine, the combinaother Wheels remain staation ith an arbor, of a plurality of sets i 'zon'xputing Wheels thereon, those in one interjacent ainong'those in another set, means for turning the Wheels, clutch connections between said arbor and the Wheels in of sa sets, means for revolving said to t the Wheels in said set to zero n other Wheels remain stationary, 's for independently turning to v said other set of computing Wheels. 4 eoinputing machine, the combih arbor, of a. plurality of sets wheels thereon, those in one among those in another set, onrning he Wheels, chi

inch is tch conrecti as bet 1 said arbor and the Wheels one off said sets, means for revolving said to to the wheels in said set to zero said Wheels remain stationary, pinions geared to said other wheels, and inea 3S ogerahie tlronph said pinions for turning to said other Wheels While the wheeis in the first remain stationary.

5 in. a computing machine, the combiith an arbor, of a plurality of sets thereon, those in one nieces for taming the Wheels, clutch connections between said arbor and the Wheels one or sai "o "iZU"I1 the Wheels in said set to zero set i itemaeent among those of the other set, et 4)" ensiying devices extendin from i: t can to TEiESl of one said sets past the s of the other of said sets, a second tens-c rrying devices mounted ecceny of the at and extending from 1198i to irheei in the other set of computing W h P i S els coaxialiy disposed, the wheels in one set intergacent among those of the other set,

V a h a tens-carrying devices extending from at: he wheel to wheel of one of said sets past the am: wheels ot the other of said sets, a second set of tens-carrying devices mounted eccentrically oi the iH'St and extending from wheel Wheel in the other set of computing ee wheels; each of said computing wheeis'havl set of operating hare for h iar having racks to is each computing tion of sets of computing In a computing machine, the e01nbiset interjacent among" those in another set,

ther Wheels remain stationary,

The combination otset-s of computing sets, means for revolving saidwheels coaXially disposed, the wheels in one set interjacent among those of the other set, a set of tens-carrying devices extend ng from wheel to wheel of one of said-sets past the wheels ofthe-other of said sets, a second set of tens-carrying devices mounted eccentricallyof the first and extending from wheel to wheel in the oth set of computing wheels; each of said computing wheels hav-- ing a pinion, and a set of operating bars for engage two pinions, one in each computin wheel set; and a clutch connecting each 0 said pinions to its associated computing wheel. I

.19. A power-driven intermittent tens-carrying driver having a plurality of complete sets of segments or teeth thereon, those in one set interjacent between those in another set.

20. The combination of a plurality of sets of computmg wheels; a single setof driving means therefor arranged to concomitantly operate wheels of the same denomination in different sets; key-controlled means or devices for governing the extent of movement of the wheels so operated; a driver for said wheel-driving means; and a plurality of sets -of individual tens-carrying trains operable by said driver, one set of trains for each set of computing wheels, each computing wheel having a starting tooth for its tens-carrying train.

21. The combination with a single system of key-set pins, of aplurality of totalizers,

and means cooperating with said pins for cross-adding on one totalizer and simultaneously accumulating on another totalizer the sum or product of'the successive cross-additions.

22. A power-driven intermittent tens-carrying driver having a plurality of complete sets of segments or teeth thereon, the segments on one set lying in a. territory overlapping the territory of another set.

2-3. The combination with a plurality of sets of computingwheels, of a single set of multiple racks having a plurality of sets of teeth facing in the same direction and arranged to actuate all of the sets of computing wheels, said computing wheels engaging said racks from the same side.

24. The combination with a plurality of sets of computing wheels, of a plurality of multiple racks for actuating all of said sets' sponding to a number to be computed, and

single acting transferring means for subsequently'running up on a plurality of said totalizers at the same time each successive group ofdigits indexed by said indexing J ranged to' siniultaneously actuate ailiof tions; means individual to each denoi puting wheels, the computing wheels head being interspersed between the oil wheels'in the corresponding group. I

21.111 a computing machine, the combination of a plurality of sets. of computing wheels, corresponding wheels in said sets acting in groups of accordant denominanational group arranged to simultaneously actuate all of the wheels in the corresponding group; a set of carry-over devices for each set of Wheels; and a driving element common to all of said sets or carry-over devices.

28. in a computing machine, a rack forked at one end and unitary at the 0th end, with two sets of teeth on the to endvof the rack facing in out one direction, for simultaneously actuating a o'l' co-n'r puting wheels.

29. The combination with a plurality computing heads each having a set of c of e c n-- nc ier computing wheels, V and the comp wheels of one set lying next adjacei t computing wheels between which the interspersed, of means for rotating all said computing wheels at the same time to run :4 computations. v

30. The combination with a plurality computing heads each having a set of cone puting wheels, the computing wheels of one. head being interspersed between the other computing wheels, and the computing wheels of one set lying next adjacent the computing wheels between which they are interspersed, of means for yolring computing wheels of the same'denoinination for rotating the same at the sametime to run up a computation in a plurality of said o mputing heads.

31. The combination with a plurality of computing heads each having a set of com phting wheels, the coinputingwheels on one head being interspersed between the other computing wheels. and the computing wheels of one set lying nex' @ldjlH-Qllt he computing wheels between which the are interspersed, of tangentie 131; means for engaging the peripheric i said comput inn; whee-ls, said tangentially actin me us being united in units the computing uh computing wl'ieeis otthe same den computziiious theieo iug heads.

The C(IlliiiiilfltiOil vi of computing w 1 wheels of one set being; the other computing w over devices foiem: wheels, the can i with one 5&1; of i 19 cumputing wheels in ski coaxlally-211121uged comma. i

(if muhii ie 1' 0.252111 so that each. nick 115 i'uiity of said cuzifileii;

wheels.

The euuihin;

i: h 2: plurality of A he cuznuuting; means can concolnitan l erspei'sed han (he set.

eeiegoi'; L .ie cunzhiiiatian with phnality i 3 computing wheeis, he "(haze/s of the encmachixie" 011 ii inciiuie mm; of 3 devices a cal'rv-uvei' mechauisz 1 v me M k v. 1601b. lllLlhdblg i L) romvhzie can being: :11"

$110 to one another and a cum menus for iii! (if said wine;

The

of one i'ieing v fi'mjn. the segnien .x-mmiec'i means (h id mll'l'ifll'fii 7. The cumhiimtian WI iu 'ei'jucent cuinpu in wi. 1': ch burs fur victim" i h0eis each rack hm hei' mmiizinti retain more 50 whoeis devices seiiuhio ieut 0f movement, of SLA. setiiugr said (R vive-s I 58. The cvmhination with a ph mi-CY of multlpie coii'ipuimg s arrange each correspor cumputi e: ilg'ie or. I'DQlil'lbQiS 1.01- of cuiupuiiug Wheels, Of a I 0 wt 0 (ieiei'iuining the extent of rotntisn of all 55 multiple rack bars for actuating 111 0 said sobs oi computing \Yheeis. said members 120 sets of computing \V1 L']b' mncumitzintzhg a1ehazing unitary at one my! mid multiple, at vives setmhle to deielmine the e tent of the other end, so that each engages and opmuvoment of said rack bars, and keys for emteg :1 piui'al'iy of said confliuiinsz whee .seitinfi mid devices. 7 The eomliiiuutiun with :i phii aiiiv 60 39. The cm'uhiimtiun with a plurality 11? computing; head each nisinp" z. "1111- ssets; of mmputing Wheeis the W1 1 lii ipuiu iii (ii "ei'ent sets being located inter i A a) othea'. {if actuating means ext compu whe compu .nt denominiw mini in' inhe :iiii den w plum denonm each computing head, whereby each denominational member may control'the rotation of a 'of said tens-carrying mechanisms concentrated so' that the assisting or boosting mechanism for one te s-carrying mechanism overlaps the territory of the assisting or boosting mechanism for another tens-carrying mechanism.

47. The combination with a shaft, of a plurality of computing heads mounted on the same shaft, tens-carrying mechanism for each computing head, said tens-carrying mechanisms being offset. from each other, so as to aid corresponding heads from different points, and a boosting or assisting mechanism for all of said tens-carrying mechanisms mounted to rotate about. the same axis. 1

48. The combination with a plurality of computing heads, ,each including a series of computing Wheels, of a tens-carrying mechanism individual to each of said computing heads, said tens-carrying mechanisms being oflset vertically, a boosting or assisting mechanism common to all of said tens-carrying mechanisms, and a general operator for rotating said computing wheels and for actuating said boosting or assisting mechanism.

49. The combination with a plurality of computing heads, each including a series of computing wheels, of a separate tens-carrying mechanism for each of said computing heads, said tens-carrying mechanisms being ofiset vertically, an assisting or boosting device common to all of said tens-carrying mechanisms, and a general operator for rotating the computing wheels of all of said copies a: this patent may be obtained for computing heads concomitantly during each .stroke of said general operator 1n one direction and for rotating said assisting or boosting device to actuate all of said tens-carrying mechanisms during each stroke of said general operator in the opposite direction.

50. The combination of a plurality of coaxial sets of computing wheels, means for concurrently actuating wheels of similar de nomination in different sets, a multiple carry-over mechanism for said computing wheels including a plurality of sets of complete carry-over entireties, said sets of carry-over 'entireties being arranged eccentrio to one another, and a common driving means for all of said entireties, said common driving means having co-axially arranged elements corresponding to each of said computing wheels.

- 51. Ina computing machine, the combination with a plurality of sets of computing 1 wheels, those in one set interjacent among those in another set; of rack bars for operating said wheels, each rack bar being forked, and each fork having racks to operate wheels of'similar denominations in different sets; and driving means commori tto all of said racks. V

52. The combination, with a plurality of computing heads, each comprising a set of computing wheels and a power-driven tenscarrying mechanism therefor; ofa single set of actuating members for concurrently rotating all of said'wheels in the same direction during each movement of said members in one direction, each member arranged to concurrently rotate all. of the wheels of the samedenomination at such time; difierential means associated with said actuating members for controlling the extent of movement thereof, whereby at each computation the same number is run at the same time into all of said heads; and common driving means for said actuating members and said tens-carrying mechanisms. 7

BURNHAM O. STIOKNEY.

Witnesses:

K. FRANKFORT, C. RIPLEY.

five cents each, by addressing" the Commissioner of Patents, Washington, D. G. 

